Electric bell



June 28 1927- F, HENDRY ELECTRIC BELL Filed July 15. 1924 INVENTOR M7? fwd "W ATTORNEY Patented June 28, 1927. l I I UNITED STATES PATENT OFFICE.

WILLIAM F. HENDRY, OF OSSINING, NEW? YORK, ASSIGNOR TO MANHATTAN ELEC- TBICAL SUPPLY COMPANY, INCORPORATED, 035 YORK, N. Y., A CORPORATION OF MASSACHUSETTS.

ELECTRIC BELL.

Application filed July 15, 1924. Serial No, 726,181.

""" 'i This invention relates to new and useful mit the ends of-cores 6 and 7 and, as the improvements in the assembling and mountnext operation, the ends of the cores are inc; of electromagnets. forced into perforations 18 and 19 until The invention is illustrated in the drawthey slightly protrude therefrom. The perings asembodied in an electric bell strucforations are thus enlarged. and the metal ture, Fig. 1 being, a front view of a bell, and around them will now assume the form illus Figs. and 3 illustrating; successive stages trated in Fig, 3, of the assembling process of the magnet It will be seen, therefore, that the attachstructure. ment of the pole pieces to the plate 17 con- The bell consists of the usual gong 1 sists substantially in performing two stages mounted on a suitable base 2 and adapted to of a drawing operation. The condition of be operated by a hammer 3 provided on the the plate 17 after the tirst stage of the drawend of an elongated arniiature 1. The armaing operation. is shown in 2, and its ture is maintained. in its normal position by condition after the second stage is shown in 15 means of a leaf spring 5 mount-ed on a. Fig. 3. The cores 6 and 7 are the tools used bracket 10 which carries also the magnet in tl e second drawing operation and are structure proper. The bracket 10 is rivleft in the work. The resiliency of the plate eted to the base 2. The magnet structure 17 "will be sutiicient to insure a solid grip consists of two soft iron cores 6 and 7 suron the cores by friction between the plate rounded by suitable coils 8 and 9, one of the and the core ends. The assembling operas terminals of which are connected in the well- -tion can of course be. readily controlled to known manner to binding posts 11 through insure proper spacing of the plate 17 and conductors 12 and 13. The other ends of itis not necessary to take special precautions the coils are interconnected at 1 1. 15 and for protectii'ig; the coils 8 and 9, as would be 16 are the usual. enlarged pole pieces of the the case if the cores were welded to the cores. The other ends of the cores 6 and 7 plate 17.

are held in. a plate 17 which forms part of lVhat I claim is:

the bracket 10, but is bent up at right angles. 1. The method of assembling electromag- The plate 17 serves as a mounting for th nets which consists in first punching two 30 magnet as well as a means for completing holes in a metal plate, the metal around the go th ti i it, holes being: drawn into rings of smaller di- It ha b th a ti t mou t th ameter than the ends of the magnet cores, magnet structure on plates like 17 byweldthen forcing the ends of magnet cores carryi i ti th d f th Cores t th ing the coils through the perforations. and plate and in order to make this possible. it finally mounting the magnet by means of :55 was necessary to turn down the ends of the Siilfl P a ecores, the recessed ends fitting quite snugly 2. In an electric bell, a magniet structure within holes in the plate 1.7. In order to comprising two cores with windings theresare the expense of a special. riveting or on, said cores terminating at one end in pole Wtddinnj operation and to obviate the nccespieces and being of the same diameter 98 sity of turning down the ends of the cores. throughout their lengths, and a relatively in accordance with the present invention the thin plate provided with two perforations cores 6 and 7 are of uniform diameter within which. the other ends of the cores are througl'iout their lengths. Two holes 18 and held by friction between the ends of the 45 19 are punched in the plates 17. lVhen this cores and the plate.

punching operation is performed the cross In testimony whereof, I have signed my section of the plate 17 will be as illustrated name to this specification this 14th day of in Fig. 2 with the metal drawn into a rim July 1924.

surrounding the perforations 18 and 19. 60 The perforations are not large enough to ad W ILLIAM F. HENDRY. 

